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Note: The individual income tax rate decreased on January 1, 2015 to 3.75%. The IL-700-T, Illinois Withholding Tax Tables for 2015, is now available on our website at, which enables employers to determine how much tax to withhold from employee paychecks under the new rate.

For more information, see:

  • FY 2015-09 - Illinois Income Tax Rate Decrease Informational Bulletin
  • FY 2015-08 - Withholding Tax Changes Informational Bulletin

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  • Substitute Forms Developers
    If you produce, or intend to produce, your own version of the official tax forms, you can find information here about our technical specifications, enrollment, and testing requirements.